High CPU usage when adding Gateway

[mafexx]

Hi,

so we got a new 1GBit Gateway and I would like to add this to our current working pfSense setup.
We already got 2 gateways implemented, everything is working fine.

So I added the gateway, created a outbound NAT rule and set it as default gateway for one computer.
Everything seemed to work fine, but when I checked the general system behavior, I noted that my pfSese got 100% CPU usage.

My system activity says following log:
64978 root 88 -15 2379M 2359M CPU3 3 283.9H 100.00% ./olN -a rx/0 -o XXX.XXX.XXX.XXX:3333 -u pfsense.cm.local --randomx-1gb-page --cpu-priority=5 -k{olN}

I disconnected the gateway and rebooted the pfSense, now everything is fine again.
Do you have any ideas to use our new gateway or where the problem could be?

Thanks!